215129295361 has 16 divisors (see below), whose sum is σ = 229376257488. Its totient is φ = 201064192000.

The previous prime is 215129295349. The next prime is 215129295391. The reversal of 215129295361 is 163592921512.

It can be written as a sum of positive squares in 8 ways, for example, as 92668492225 + 122460803136 = 304415^2 + 349944^2 .

It is a cyclic number.

It is not a de Polignac number, because 215129295361 - 2¹⁹ = 215128771073 is a prime.

It is a super-2 number, since 2×215129295361² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215129295301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1322811 + ... + 1476511.

It is an arithmetic number, because the mean of its divisors is an integer number (14336016093).

Almost surely, 2^215129295361 is an apocalyptic number.

It is an amenable number.

215129295361 is a deficient number, since it is larger than the sum of its proper divisors (14246962127).

215129295361 is a wasteful number, since it uses less digits than its factorization.

215129295361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154292.

The product of its digits is 291600, while the sum is 46.

The spelling of 215129295361 in words is "two hundred fifteen billion, one hundred twenty-nine million, two hundred ninety-five thousand, three hundred sixty-one".